From my experience, and mine only, you need to get the infected piece out of your shop.
I have had infestations in my shop before, but I have never had them move to new stock. Powder post have a tendency to lay their eggs in the exit hole, and re-infest the same piece.
That being said, they will move form piece to piece, but favor pieces that have cracks, knots or crevasses to lay eggs in. They are also prone to high starch hardwoods(maple,cherry, etc), but will eat damn near anything.
The last time I had an issue, I grabbed anything with an exit hole in it, and burned it. Since then, no issues, but anytime I find anything with any evidence of bug infestation, I steer clear, or if it does get into my shop, it takes the express route to the fire pit.